Based on the current W3 Web Components draft, X-Tag enables the custom element portion of the proposal. Custom elements let you register new tags/elements with the parser so they are recognized and inflated with special abilities you define.
http://mozilla.github.com/x-tag/
JavaScript Libraries and Functions
Get access to data on 3,950 websites that are X-Tag Customers. We know of 2,908 live websites using X-Tag and an additional 1,042 sites that used X-Tag historically and 1,227 websites in the United States.
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Get a list of 3,950 websites using X-Tag which includes location information, hosting data, contact details, 2,908 currently live websites and an additional 9,880 domains that redirect to sites in this list. 1,042 sites that used this technology previouslyand 1,227 websites in the United States currently using X-Tag.
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